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/** |
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$Id$ |
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Copyright (C) Authors contributing to this file. |
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This file is part of BASE - BioArray Software Environment. |
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Available at http://base.thep.lu.se/ |
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|
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BASE is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License |
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as published by the Free Software Foundation; either version 3 |
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of the License, or (at your option) any later version. |
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|
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BASE is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with BASE. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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package net.sf.basedb.util.extensions.xml; |
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|
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import java.lang.reflect.Method; |
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import java.util.HashMap; |
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import java.util.Map; |
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import java.util.regex.Matcher; |
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import java.util.regex.Pattern; |
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|
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import net.sf.basedb.util.extensions.ActionFactory; |
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import net.sf.basedb.util.extensions.RendererFactory; |
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|
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/** |
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A value converter that can be used on all setter methods |
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that has been annotated with the {@link VariableSetter} |
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annotation. The input string will be scanned for |
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parts that match <code>$VARIABLE$</code> and have that part |
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replaced by the actual value of a defined variable. Undefined |
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variables are not replaced. See {@link #setVariable(String, String)} |
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for more details. |
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|
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<p> |
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Web client note! The web client application defines the variables |
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<code>ROOT</code> and <code>HOME</code> which are the paths to |
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the web application root directory (<code>/base2</code>) and the |
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home directory (<code>/base2/extensions/xxxx</code>) of the current |
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extension. This means that the XML configuration file may |
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contain values like <code>$ROOT$/images/copy.png</code>. The |
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<code>$ROOT$</code> portion will automatically be replaced with the |
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correct path if the factory method is annotated with the {@link VariableSetter} |
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annotation. |
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|
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@author nicklas |
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@version 2.7 |
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@base.modified $Date:2008-03-20 12:15:25 +0100 (Thu, 20 Mar 2008) $ |
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*/ |
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public class VariableConverter |
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implements ValueConverter |
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{ |
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|
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// Pattern to match $VARIABLE$ |
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private static final Pattern VARIABLE = Pattern.compile("\\$(\\w+)\\$"); |
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|
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// Contains variable values |
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private Map<String, String> variables; |
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|
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/** |
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Create a new variable converter. Use {@link #setVariable(String, String)} |
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to define variables and {@link XmlLoader#addValueConverter(ValueConverter)} |
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to register this converter with an XML loader. |
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*/ |
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public VariableConverter() |
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{} |
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|
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/* |
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From the ValueConverter interface |
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---------------------------------- |
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*/ |
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@Override |
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public String convert(String in, Method method) |
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{ |
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if (variables == null) return in; |
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if (!method.isAnnotationPresent(VariableSetter.class)) return in; |
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Matcher m = VARIABLE.matcher(in); |
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StringBuffer sb = new StringBuffer(); |
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while (m.find()) |
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{ |
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String variable = m.group(1); |
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String value = variables.get(variable); |
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if (value == null) value = m.group(); |
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m.appendReplacement(sb, Matcher.quoteReplacement(value)); |
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} |
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m.appendTail(sb); |
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return sb.toString(); |
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} |
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// --------------------------------------- |
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|
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/** |
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Set the value of a variable. If a setter method of a factory class |
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({@link ActionFactory} or {@link RendererFactory}) is annotated with the |
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{@link VariableSetter} annotation the |
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XML loader will scan the value from the XML file for replacement |
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tags, <code>$VARIABLE$</code>, and replace the tag with the value |
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of the variable. If the variable doesn't exists, the tag is left |
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untouched. |
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|
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@param name The name of the variable |
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@param value The value of the variable, or null to remove |
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the variable |
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*/ |
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public void setVariable(String name, String value) |
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{ |
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if (variables == null) variables = new HashMap<String, String>(); |
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if (variables == null) variables = new HashMap<String, String>(); |
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if (value == null) |
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{ |
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variables.remove(name); |
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} |
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else |
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{ |
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variables.put(name, value); |
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} |
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} |
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|
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|
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/** |
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Get the value of a variable. |
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@param name The variable's name |
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@return The value, or null if it doesn't exists |
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*/ |
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public String getVariable(String name) |
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{ |
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return variables == null ? null : variables.get(name); |
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} |
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} |